chore(providers): re-pin pkg past #714 and restore the managedredis variant dedupe test #723

Context

#714 (merged as 81a7090) makes pkg/recfilter dedupe each term and payment variant against the full held quantity (#703). Providers only pick it up when their pkg pin moves to that merge. Until then the over-buy (one held unit reducing only the first variant) still happens through the provider modules.

That PR also removed TestHeldReservation_VariantPin from providers/azure/services/managedredis/held_reservation_dedupe_test.go. It asserted the old 1, 2, 2, 2 behaviour, and CI runs the provider modules both through go.work (new pkg) and with GOWORK=off (pinned pkg), so no single assertion could pass both.

Work

• Re-pin providers/azure and providers/aws to the fix(recfilter): dedupe each term and payment variant against the full held quantity #714 merge (first commit, mechanical: go get plus go mod tidy under GOWORK=off).
• Restore the managedredis variant test asserting 1, 1, 1, 1.
• Check the other provider tests that exercise recfilter variants (Azure compute, savings plans, reservations, AWS recommendations) still pass under GOWORK=off.
• CHANGELOG: nothing new beyond fix(recfilter): dedupe each term and payment variant against the full held quantity #714's entry unless a provider test changes behaviour.

Order

After any other provider PR that bumps pkg, to avoid re-pin conflicts.